I have two old printers with IEEE 1284 B ports. I am using a USB to IEEE-1284 Parallel Printer cable for each; however, I can only get the PC to recognize one printer. Both printers and cables test ok. It appears the PC is limited to 1 USB to IEEE-1284 Parallel Printer cable. Is there a way to get the PC to regognize 2 IEEE-1284 Parallel Printers?
Check the serial numbers and other USB identifiers from the cable; if they're the same then the driver may not be able to tell the two apart.